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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea2dd95ba92bbcb331dbf72fd2b1efb7b778a595f8a3171f0c3f27084395542' 
  AND token = 'BY2s+BUWZcQ7E7ab/BY1UWEKimtLZ5vzxPAfqTJ2R1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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