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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6521191f5d77f99713e50221cb59f8f478c6ba3362fa35d39847d487c442d28' 
  AND token = 'eA1D1aRxKEYKGAI9s1H41Ny3ce5sx83lANyylpwAlIo=' 
  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"
    }
  }
}