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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2d8da74e8fd747c77ab76a22a520a513a5994d0f13e66334652822573e3a7b' 
  AND token = 'txCKycCrfMWezajjRJ1f5v0uv1D4DV7Y9lEYkfqIQKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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