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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e62b07d5148504dea0bef435f174e7180ce5b2e08c540b6bf02b715773a197' 
  AND token = 'o0bX6phdZ8R1YIEQ2bXPjpqyWuI2RWtPRansQqR4M2Y=' 
  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"
    }
  }
}