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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32943cda4e4b9bf9782eebf14f32eb5f5d4c879ef4803e1efe63846575621222' 
  AND token = 'sOsVSm2dDiUZXs54Zgc1XsHYKB9zW3T0c5AzerSuX28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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