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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebcf77b52476f988c4f696a1d816d2a27b8e728612dc70f7033cc03f128d4e4' 
  AND token = 'Oag/iH2kk7hmO+ct/MTUJqbdU8GXEbKd3Nw6uLgIlzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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