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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4331180b6f2176a655cac627833791ac0186f622a643e1aa21da835c9b68357d' 
  AND token = 'JLY7n6CIjBS3z30y8A2549hoI90qhp4VLTch/Iho8mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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