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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53cecd3ca5b8339d87705ca97e636ea47978b54a52e01af873318fe1f40c5a09' 
  AND token = 'UtqyKrhyySszAdUaT6xVVvRm3PklF+u4my4BRAvFbWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}