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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31afa2a6382a9640099d25a418c544080d6781f0f3178caa03df61c01c7a1571' 
  AND token = '88+erJBxN3QzEvAlNiqB70GlQRxonc1/eoaaemQ3vdo=' 
  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"
    }
  }
}