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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf19d8d2dafdd24289cedf954d872c26597ace2f396e2d0765db34773a59351a' 
  AND token = 'i4ovvXdpDzmht03MmwZC8wgpP/5FMzDH9M3VxOrb1ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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