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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd53ba8590f1bb11ce17355ca7df63e3941d4cde115530566b98ceb2cc2992a6' 
  AND token = 'yx0JLRHV4L4i+8u7ey2bq2UK4fVIdCDTyhJvKI7+90U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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