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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76515548a8d0a5218d679f3c1b7ce9483c6785901bb89e0334033a0cddab5a1' 
  AND token = 'ulin3jNWyzE4u6GEWP8vzkWJ0aL+WHEGmRHVeU3DYdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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